<?php
	//
	function check_serialization( $string, &$errmsg ){
		$str = 's';
		$array = 'a';
		$integer = 'i';
		$any = '[^}]*?';
		$count = '\d+';
		$content = '"(?:\\\";|.)*?";';
		$open_tag = '\{';
		$close_tag = '\}';
		$parameter = "($str|$array|$integer|$any):($count)" . "(?:[:]($open_tag|$content)|[;])";            
		$preg = "/$parameter|($close_tag)/";
		if(!preg_match_all( $preg, $string, $matches )){            
			$errmsg = 'not a serialized string';
			return false;
		}    
		$open_arrays = 0;
		foreach( $matches[1] AS $key => $value ){
		    if(!empty( $value ) && ( $value != $array xor $value != $str xor $value != $integer )){
		        $errmsg = 'undefined datatype';
		        return false;
		    }
		    if( $value == $array ){
		        $open_arrays++;                                
		        if( $matches[3][$key] != '{' ) {
		            $errmsg = 'open tag expected';
		            return false;
		        }
		    }
		    if( $value == '' ){
		        if( $matches[4][$key] != '}' ){
		            $errmsg = 'close tag expected';
		            return false;
		        }
		        $open_arrays--;
		    }
		    if( $value == $str ){
		        $aVar = ltrim( $matches[3][$key], '"' );
		        $aVar = rtrim( $aVar, '";' );
		        if( strlen( $aVar ) != $matches[2][$key] ) 
		        {
		            $errmsg = 'stringlen for string not match';
		            return false;
		        }
		    }
		    if( $value == $integer ){
		        if( !empty( $matches[3][$key] ) ) 
		        {
		            $errmsg = 'unexpected data';
		            return false;
		        }
		        if( !is_integer( (int)$matches[2][$key] ) ) 
		        {
		            $errmsg = 'integer expected';
		            return false;
		        }
		    }
		}        
		if( $open_arrays != 0 ){
		    $errmsg = 'wrong setted arrays';
		    return false;
		}
	   return true;
	}
	//
?>